Kind of bouncing back and forth between here and the "lonely" thread, I'm going to say that the advice to live less encumbered by the expectations of society or at least the way we
think society expects, can pertain to folks of any age.
A long time ago I read "The Three Boxes of Life" which basically argued that school-job-retire shouldn't be compartmentalized and taken for granted as the only right progression in life; that instead we should do all three, continuously, all our lives. My favorite saying is:
"The difference between a rut and a grave is how long you spin your wheels."
I did a little running around as a kid, basically as a "construction" bum really, working in CA, UT, ID, AZ and a few other places before I was 21. I also liked walking into the mountains, Sierras, Uintas, Bitterroots and the Rubies out in the middle of Nevada.
But I settled down about then and needed to make a living; it happens. As to your original point Ibon, yes, definitely do not have kids if you don't want to be encumbered. At least for me, I became the nest builder after the chicks arrived, LOL. Unfortunately, acquisition became routine for me, so that now that our kids are long moved away, I'm encumbered by stuff.
We have a lot of stuff that at one time (and still to a great extent) makes me feel rooted and secure. Not empty tuna cans type of stuff, both of us are doers rather than "experiencers" so we collect all manner of actually useful tools from kitchen to woodworking to computer to gardening plumbing, electrical . . . one dollar items to thousand dollar items.
Which isn't to give the impression we don't also have a great deal of just plain old stuff: we do. Knick-knacks, semi-to-not-at-all sentimental gifts received for a long forgotten occasion, mementos of something or other, and lots of potentially usable-someday stuff - hurricane lamps, corn shellers, pistolas. When we moved here from a 1,000SF house to a 2,200sf house + 30x40 shed, + 40x40 shop + greenhouse + summer kitchen + hay barn - I thought 'what will we do with all this space?"
then we proceeded to fill it all up with stuff, LOL.
Here at 56 the actuaries would say I have maybe 20 productive years so I'm thinking it is time I finally unencumbered myself of stuff. I am in the somewhat unique position of being able to work from anywhere I can get a cell signal or McDonalds' WiFi, so why not do a little wandering around - albeit fossil fueled wandering? Learn/work/play.
This of course relates to my post in the "lonely" thread (thanks everyone for the congratulations BTW) in that along the way we would stop occasionally to visit with this kid or that great grandkid
(hear that Mrs. Ibon?

)
.
The legitimate object of government, is to do for a community of people, whatever they need to have done, but can not do, at all, or can not, so well do, for themselves -- in their separate, and individual capacities.
-- Abraham Lincoln, Fragment on Government (July 1, 1854)